DE3219280A1 - DEVICE FOR THE FIRST MAINTENANCE AND RENEWAL OF THE WORKING SURFACE OF CONTROL CAMS, ESPECIALLY BRAKE KEYS FOR MOTOR VEHICLES - Google Patents

Description

The invention relates to a device

for initial processing and renewal of the work surface of Control cam, in particular of brake keys for motor vehicles by means of a face milling cutter or on its own Axis of rotation vertical surface of a grinding wheel, e.g. by means of a cup-shaped grinding wheel, whereby the The profile of the brake key is an involute or an Archimedean spiral.

It is used to edit the work surface of Control cam and brake wrench a device known in which a face milling cutter is used as a tool. The description of such a device is on pages 36 and 37 of number 5, year 1978, of the Soviet Find the magazine "Vesztnyik Masinosztroenyija".

In this known way of working, the axis of rotation of the face milling cutter with which the Work surface of the workpiece is processed on the '

The axis of rotation of the workpiece is vertical. The axis of rotation of the ί

Face milling cutter is with the plane for guiding the main H,

headstock parallel and in relation to the axis of rotation «

usually evasive of the workpiece. §

The spindle for driving the workpiece f

closes via a gear ratio of 1: 1 upper f

transmission to a control shaft. There is a | on the control shaft Heister cams attached to which the on the guide | movable main headstock adjusted by a spring I

will. The axis of the main spindle or the axis of the ij the face milling cutter attached to the main spindle is connected to the 1

Direction of movement of the main headstock parallel. During one rotation of the control shaft, the profile i.e. the work surface of the workpiece through the face milling cutter machined according to the profile of the master cam, based on the principle of mechanical copying

rens ♦

A major disadvantage of this known solution is that the level of technical Execution of the device in extraordinary dimensions Behind the technical level of the process, which process to carry out the known device falls short is called. It should be noted that the surface formation principle of the feasible on the known device with a face milling cutter because of its low Cost is one of the most advanced on a world scale.

From a differentiated point of view, the well-known

Device has the following disadvantages:

- The master cam and the operated mechanism are touching along a line, so the load capacity of the master cam is limited »

- the production of the profile of Meisternockens is \ costly and of limited accuracy; a different master cam is required to process each individual control cam;

- The usefulness of the known device is in terms of shape and type of machinable Control cams limited, are easy to edit with it z.3. the profiles marked with a prime in Fig. 2, where the different profile sections meet at the small central angle with a large change in radius A R follow and / or the profile sections along repeat the continuous curve twice or more times.

Not editable X3t also on the known device a brake key of any Profile, such as the working surface of the brake key according to Hungarian patent specification No. 175 132 this brake wrench is the profile of the work surface as an involute not derived from a base circle, of which

Center coincides with the axis of rotation of the brake key , but from a base circle, the center of which is from the axis of rotation of the brake wrench3 in a certain direction is pushed out. This design compensates for the decrease in braking force during use. In Fig. 3 i3t at 3rem3 keys from the same confirmation and the same installation location the one with the axis of rotation concentric base circle having involute profile with stem, the involute profile having an eccentric base circle illustrated with dashed linivj.

Could be when renewing the worn work surface dee the brake wrench with the dashed line Line illustrated involute derived from a base circle with an extended center point then a work surface with a higher utility value than the utility value of the 3retnskey3 was when it was first processed. By the well-known Apparatus is not assured of such a possibility, which is one of its greatest powers.

Another disadvantage is that on the known device only one workpiece at a time can be processed, which is disadvantageous in terms of productivity.

The invention is based on the object, in contrast to the known, such a device for the initial processing and renewal of the working surface of control cams, in particular of brake keys for motor vehicles by means of a face milling cutter or the surface of a grinding wheel perpendicular to its own axis of rotation, e.g. by means of a cup-shaped grinding wheel, The profile of the 3reos3chlÜ3sel is an involute or an Archimedean spiral, which device does not contain a cam control and is suitable with high productivity for the processing of such work surfaces where

the different profile sections each other with one to one small central angle belonging to large change in radius and / or follow the profile sections along the Repeat the control curve twice or more times.

According to the invention, this object is achieved a device for initial processing and renewal of the working surface of control cams, in particular of brake locks for motor vehicles by means of a face milling cutter or the surface of a grinding wheel perpendicular to its own axis of rotation, e.g. by means of a cup-shaped Loosened grinding wheel, with the profile Her brake key is an involute or an Archimedean spiral, and which device is characterized in that a kinematic chain connecting a non-rotatably clamped workpiece and a bed slide with one its outer part attached to the workpiece headstock in the same direction, one on the non-attached Inner part of the freewheel following, working in the opposite direction to the freewheel in the same direction, one-sided claw coupling, an intermediate shaft connected to one half of the one-sided claw coupling Subsequent gear transmission, and engaging in the gear transmission, the rotary motion in a straight line contains transforming elements.

The inventive

measure device designed so that the one-sided Claw clutch is spring-loaded.

A preferred embodiment of the invention The device is further characterized in that between the geometric axis and the axis of rotation the workpiece-carrying tips of another workpiece clamping device eccentricity of fixed or adjustable value.

Furthermore, it is advantageous to use the invention

according to the device in such a way that it has a number of cutting tool heads and several with the workpiece spindle! Contains slip-free connected workpiece spindles, or that the angle between the main spindle and the level of the bed slide guide is adjustable.

The idea of the invention can be as follows sum up:

- Are the workpiece and the bed slide carrying the main headstock in i

the spatial arrangement of the known |

Device, but with a gear over |

settlement, with a turning movement in a straight line Ϊ],

linear motion deforming elements, e.g. ί;

Ki- | containing gears and racks

connected to the nematic chain, this becomes; |

Profile of the machined. -Pool an evol- |

be vente. ΐι

'./erden cine such an arrangement and also- A

such a kinematic chain, but a main &

headstock with a relative to the $

Level for guiding the bed slide diagonally |

adjustable axis is used, the f

Profile of the machined surface an archi- Hi

be the Swedish spiral. *

Developing the thought further: it will be ί ensures that between the geometric

Axis and the axis of rotation of the front part ^ -auf- |

clamping device eccentricity of fixed %

or adjustable value, that is, |

the workpiece is rotated around an axis, $

the one with the mechanical axis of rotation of the |

Workpiece does not coincide, the |

Possibility created such curves- 1

deliver, which by the transformation of %

Involute and Archimedean spirals with f.

If misalignment come about. In such a way can

II by changing three factors: gear transmission, Tilt angle of the main spindle axis in relation to the plane of the bed slide, eccentricity, an unlimited amount can be made from different curves.

This can be illustrated as follows: It is assumed that in the course of production Profiles in the shape of involute or Archimedean spirals are to be produced, in which profiles the difference between the base circles and the difference between the eccentricities is at least 0.1 mm. Becomes a fixture is used, which has a base circle area of

fi 20 mm, the necessary angle adjustment options

If the main spindle, as well as an eccentricity range of

Over 20 mm realized, then you can

I (200 involutes * ■ 200 spirals) χ 200 transform-

|. tnated layers = 80,000 different curves

I made.

I - The problem with the too small central

Large changes in radius belonging to the H angle and the

S problem because of the two or more repetitions

It of the work surfaces can be switched by one in series

|| one-sided claw coupling and a free

H run and through the arrangement of the same in which the factory

p piece and the kinematic chain connecting the bed slide

ff must be released in such a way that the clutch and the freewheel of

|! opposite operation should be. The coupling

ff opens in the direction of rotation in which the freewheel

Ü closes and backwards. One half of the same sense

fp gen freewheel is attached to the V. 'workpiece headstock.

i§ The advantages of the device according to the invention

% _t are the following:

ig - The performance enables the cheap,

jf highly productive and precise processing of the

$ _r working surfaces of sturdy cams, in particular

-lO-

those of Bretnskeys;

- it enables inexpensive, accurate and highly productive machining of work surfaces, which are otherwise only made by forging or by copier finger milling of low levels For example, the key processing could be done according to the above-mentioned Hungarian ones Patent;

it enables such machining, e.g. of wrench working surfaces, which are competitive with the finished product is .

With the device according to the invention can work surfaces that are several times more precise are manufactured than with the finish forging.

In general, it can be stated that the device according to the invention is based on a new finding based on the productive, accurate and cheap initial machining of the working surface of control cams, in particular of brake keys in an extraordinarily elastic way to such an extent, which has not yet been done Device was capable. At the same time, it enables the worn working surface of the brake key to be renewed As a result, they have a higher use value than their original value.

The invention is further elaborated on the basis of

Drawings explained, which represent an example embodiment of the device according to the invention.

One of the characteristic profiles that can be produced with the device according to the invention can be seen in FIG. 1.
Fig. 2 illustrates the involute profile

of the brake key in its original

- Ii -

len state and in its state after the

Renovation.
Fig.3 is the kinematic scheme of the invention

mass device. FIG. 4 i3t the view of FIG. 3 from the direction IV

on a larger scale. FIG. 5 i3t the view of FIG. 3 from the direction V. FIG

on a larger scale. Fig. 6 is the individual part VI of Fig. 3 in size

rero scale.

Fig. 7 is the individual part VII of Fig. 3 on a larger scale.
Fig. 8 represents the workpiece perceived eccentrically

represent.

The task of the device is to machine the workpiece 1 illustrated in FIGS. 2 and 5, work surfaces on a brake wrench 2 and 3.

As can be seen from Fig. 4, is on the machine frame 4, the bed slide guide 5 is formed, on which the bed slide 6 can be moved. The direction of movement of the bed slide 6 is in the plane of the bed slide guide 5 viewed perpendicular to the axis of the workpiece 1. On the bed slide 6 is in one the plane of the bed slide guide vertical plane tiltable Main headstock 7 mounted in the main headstock 7 is the main spindle carrying the cutting tool head 8 9 stored. The V / inkel / ^ between the main spindle 9 and the level of the bed slide guide 5 is adjustable. The main spindle 9 is connected to the motor IO des Main gear connected via the pulleys 11 and 13 and via the drive element 12, e.g. a V-belt.

Getnäss Fig. 3, the gear 15 is attached to the shaft of the motor 14 of the auxiliary gear, which is in the the gearwheel 16 attached to the shift shaft 17 engages. That

one end of the switching shaft 17 closes the bed slide 6 converting rotary motion into rectilinear motion Machine elements, e.g. via the gear wheel 18 and the rack 19 at. The other end of the shift shaft 17 eteht over a gear train consisting of a drive pinion 20, a Intermediate gear 21, a driven gear 22 is made with the Intermediate shaft 23 in connection. The intermediate shaft 23 is connected by the spring-loaded one-sided claw coupling 24 the workpiece spindle 26 connected. One half 24a of the one-sided claw coupling 24 closes via the slide s spring 24c, supported in the axial direction by the spring 24b, |

f to the intermediate shaft 23. On one half 24a of the one | side claw coupling 24 is at least one claw 24d, | but höchtens are as many claws mounted thereon, as | ί large, the number of located on the workpiece 1 to be sawn i operating working surfaces, or the integral multiple of these | Number is. The other half 24e of the spring-loaded one-sided f term dog clutch 24 is fastened 26 sawn% to the workpiece spindle, the number of angebrachton therein flood 24f coincides with the number of working surfaces to be processed on V / orkpiece 1, or the integral multiple of this number . The inner part 27a of the freewheel 27 in the same direction is attached to the workpiece spindle 26, but its outer part 27b is retained on the V / ckstückspindelötock 28 (see FIG. 7). The spring-loaded one-sided dog clutch 24 and the freewheel 27 in the same direction work in opposite directions.

Between the tip 29 on &> de the workpiece spindle 26 and the support tip 30, the workpiece 1 is clamped for the purpose of orientation and taking it to the workpiece spindle 26 is between the V / erpiece spindle 26 and the V / erpiece 1 that engages in the bore 31 of the workpiece 1

- 13 -

taker 32 attached.

The device according to the invention works

e.g. in the case when the work surfaces 2 and 3 are involute are as follows:

I The workpiece 1 is between the tip 29

I and the 3türrspitne 30 clamped and in the face bore

I 31 oriented with the driver 32. The gears 20 and

ΐ 22 of one dependent on the parameters of the involute

I number of teeth are mounted.

I The angle between the main spindle 9 and the

I bed slide guide 5 is set to / b = O. Of the

I Distance "K" between the face of the cutting machine

I tool head 8 and the axis of the V.'erkstückes 1 is from

I nit the parameters of work surfaces 2 and 3 as surfaces

1 involute profile set depending on. The starting position

I is illustrated in Fig. 5, where the end face of the

I machining tool head 3 in the starting position 33

I find. The rotation of the main spindle 9 is activated

I tet. The rotation of the elect rociot ors 14 of the auxiliary gear drive

I is switched on in such a way that the gear wheel 18

I and the rack 19 driven bed slide 6 the V / Erk-

I piece 1 approaches with working feed. At the same time gets

I: the workpiece spindle 26 and thus together the '.Verkstück

j 1 via the gears 20, 21, 22, the spring-loaded

; f-sided claw clutch 24 and the freewheel in the same direction

|| 27 Rotation movement.

With the aid of the device set in this way, the work surface 2 becomes a work surface with an involute processed. The work feed lasts until the end of the machining, as the face of the cutting V / tool head 8 reaches position 34. Oetzt becomes the direction of rotation of the electric motor 14 of the auxiliary gear switched in the opposite direction. Of the

Bed slide 6 returns with the cutting tool attached to it Tool head 8 together in the starting position 33 back, before the rapid decline of the bed slide 6, the workpiece 1 does not rotate because the freewheel 27 in the same direction closes, the spring-loaded one one-sided claw coupling 24 separates. At the beginning of the rapid retreat of the bed slide 6, the claw 24d protrudes out of the groove 24f (FIG. 6) and engages again in the one located at a distance of 180 from the courage 24f other courage, the face of the cutting tool head attached to the bed slide 6 8 returns to the starting position 33. The work surface 3 is then processed in the manner already described wise, and with the repeated return of the end face of the cutting tool head 8 in the starting position 33 ends the processing of the two work surfaces 2 and 3 of the whole workpiece 1 in semi-automatic Cycle. The end piece 1 consists of the tips 29 and 30 extracted.

According to FIG. 8, in an advantageous embodiment of the device according to the invention, between the neometric axis 35, 37 and the axis of rotation 35, each of the './erkstüc !: 1 supports 29, 3C or another'' rizi ta t "e" of fixed or adjustable 'ert.

"is means another advantageous embodiment, if the device according to the invention of the 'Verkstückspindel 26 connected to a non-slip drive Further . includes spindle. In these "all can be determined by the appropriate number of the diameter of the chip-removing V. Erk tool head es 3 and the center distance the workpiece spindles with a cutting tool head 3 two '/ Erkstücko 1 can be processed at the same time.

In order to increase productivity, the number of workpiece spindle 26 and the cutting tool heads 8 can be increased at will. The device is not remarkably complicated as a result V.'erkstuck 1 and the bed slide δ connecting, already described kinematic chain one with V / piece spindles 26 and cutting tool heads 8 of any Number provided device can press.

The device according to the invention contains thus a cutting tool head 8 and a '.Verkstückspindel 26, or one or more cutting tool heads and several with the workpiece spindle 26 Slip-free connected V / work piece spindles.

On the device according to the invention, the workpiece spindle with the machine frame, the main be coupled to the headstock with the bed slide, or vice versa .

Claims (5)

PATENT CLAIMS Renewal of the working surface of control cams, in particular of brake keys for motor vehicles by means of a face milling cutter or the surface of a grinding wheel perpendicular to its own axis of rotation, e.g. by means of a cup-shaped grinding wheel, the profile of the Brake key is an involute or an Archimedean spiral, characterized in that a kinematic chain connecting a non-rotatable workpiece (1) and a bed slide (6) n with its outer part (27b) on the workpiece headstock (28) attached in the same direction freewheel (27), one adjoining the non-fastened inner part (27a) of the freewheel (27) in the same direction as the one Freewheel (27) working in the opposite direction, one-sided claw clutch (24), one on one with one half (24a) the one-sided claw coupling (24) connected intermediate shaft (23) adjoining gear transmission, and engaging in the gear train, the rotary motion in rectilinear motion unconverting elements contains 2. Device according to claim 1, characterized in that the one-sided dog clutch (24) is spring-loaded. 3. Device according to claims 1-2, characterized in that between the geometric axis (36, 37) and the axis of rotation (35) of the tips (29, 30) or one of the tips (29, 30) carrying the V / piece (1) other workpiece clamping device an eccentricity (e) has a fixed or adjustable value. 4. Device according to claims 1-3, characterized in that it has a or several cutting tool heads and several with the workpiece spindle (26) contains workpiece spindles connected without slipping. 5. Device according to claims 1-4,
characterized in that the angle {fo) between the main spindle (9) and the plane of the bed slide guide (5) is adjustable.